Shit man, that's a hard one to answer. On one hand there's Peridot: after a fun redemption arc where we saw her display a wide variety of emotions ranging from silly, nerdy, arrogant, bigoted, intelligent, homesick, sneaky, and assholish, she's now just a cringy, shrieking autist who panders to lesbo-shipping tumblrfags. I'm also baffled that despite being touted as a new Crystal Gem who even got to bubble her own Gem monster, Peridot got shoved into the barn to rot in irrelevance with fuck-all done with her.
Then there's Lapis, who had great potential as an icy, aloof ally with a fun arc of slowly growing to like the Earth, make peace with the Crystal Gems, and move past her trauma. I wanted more cute moments of her acting like a big sister to Steven, seeing her defrost from her icy attitude, and if she HAD to make friends with Peridot, have it done in a slow and well-written way. But nah, all her complexity and potential, like Peridot, was tossed into the trash in favor of being Zuked. Even worse is that her imprisonment in the mirror seemed like it was hinting at a genuinely darker side to the Crystal Gems, only for that to go nowhere.
Fucking damn it man, looking back at the time I was excited to see what would happen to these two makes me sad: I can't stand them anymore.